Waterco HydroStorm Plus Star 2.0 HP Impeller (63401525) unions Raypak 407A Burner Tray Without Raypak 407A Burner Tray Without Burner [0 5000 Foot] is a Raypak replacement without burner assembly for the model and elevation range shown in the product title A properly selected replacement helps restore intended temperature regulation and supports more dependable heater behavior across the supported series 0 HP impeller is designed for compatible pump applications where the original impeller needs to be replaced to restore expected hydraulic performance An impeller in this role is useful because it is directly responsible for how the pump converts motor power into water flow through the wet end